Tyre Tread Rubber Composition for Low Rolling Resistance and Wet Grip
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Solution Overview
Problem
Existing tire tread compounds face a trade-off between improving rolling resistance and maintaining wet grip and snow performance, with silica-filled rubber compounds compromising wet grip and other formulations failing to provide balanced snow performance.
Innovation Solution
A cross-linkable rubber composition comprising a blend of four diene rubbers, including a high Tg SSBR with alkoxysilane and primary amino groups, low Tg rubbers, and a combination of mercapto-based and disulfide silane coupling agents, along with a resin and filler, to achieve balanced hysteresis and snow performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If silica-filled rubber compounds are used to improve rolling resistance, then rolling resistance is improved, but wet grip deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of rubber compound composition by using a multi-component diene rubber system instead of traditional silica-filled compounds. The specific Tg ranges of the four rubbers are optimized to achieve low rolling resistance through reduced hysteresis at service temperatures while maintaining wet grip through appropriate energy dissipation at lower temperatures. This parameter optimization resolves the contradiction between rolling resistance and wet grip.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves improved rolling resistance and snow performance without compromising wet grip, as evidenced by reduced rolling resistance and enhanced snow handling and wet grip indicators.
Implementation Method 1
a cross-linkable rubber composition... a cross-linked rubber composition obtained by cross-linking such a rubber composition
Data Source
AI summary
The present invention relates to a cross-linkable rubber composition, a cross-linked rubber composition obtained by cross-linking such a rubber composition, a method of preparing a tyre and a tyre. In a cross-linkable rubber composition the cross-linkable rubber composition comprises, per hundred parts by weight of rubber (phr): ≤50 phr of a first rubber, the first rubber being a solution polymerized styrene-butadiene rubber (SSBR) comprising an alkoxysilane group and a primary amino group; ≥20 phr of a second rubber; and a coupling agent, a filler, and a resin, wherein the rubber composition comprises ≥15 phr of a third rubber; and ≥10 phr of a fourth rubber; and wherein the composition comprises ≥1 phr to ≤20 phr of at least two coupling agents wherein one of the coupling agents is or comprises a mercapto based silane and wherein the ratio of the mercapto based silane to the second coupling agent is in a range of ≥2:1 to ≤10:1.